Hey, that's the way I practice! *Stealing my damn method... *
Here's another thing that I've found useful... *While you're playing standing up (when you're really ripping it up, you know... 64th notes or something...) check out where you rest your hand (not your wrist, where your arm contacts the body). *Mark that spot with a piece of masking tape. *When you practice put your arm in the same spot. *Works for me, I find it much easier to play standing up. * *